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随着电热原子化原子吸收光谱分析的进展,无火焰原子吸收测定各种样品中的铅由于灵敏度高和简便快速而成为最主要的分析方法之一。但在某些类型(主要是非恒温炉)的原子化器中,Pb,Cd,Zn等易挥发元素往往产生双峰,这主要取决于原子化器类型及升温方式等因素。对于铅双峰的形成,有几种模型解释。Matousek等提出不同形式的铅具有不同的释放机理,从而引起多峰。加入H_3PO_4能使所有的铅在灰化阶段都转化为磷酸盐从而解决这一
With the development of electrothermal atomic-atomic absorption spectrometry, non-flame atomic absorption spectrometry has become one of the most important analytical methods for the determination of lead in various samples due to its high sensitivity and simplicity. However, in some types of atomizers (mainly non-constant temperature furnaces), volatile elements such as Pb, Cd and Zn tend to have bimodal peaks depending on the type of atomizer and the method of temperature increase. There are several models for the formation of lead bimodal. Matousek et al. Suggest that different forms of lead have different release mechanisms that cause multiple peaks. Adding H_3PO_4 can solve all this problem by converting all the lead into phosphate in the ashing stage